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(No Model.) 5 Sheets-Sheet 1. R. F. SPROULE.

RELIEF COLOR SCREW' STAMPING PRESS. No. 566,239. Patented Aug. 18, 1896.

(No Model.) 5 sheets-sheet 2. R. F. SPROULE.

RELIEF COLOR SGREW STAMPING PRESS.

No. 566,239. Patented Aug. 1-8, 1896.

(No Model.) Y 5 Sheets-Sheet B.

R. F. SPROULE. RELIEEI COLOR sGREW STAMPING PRESS. No. 566,239. Patented Aug. 18, 1896.

(No Model.) 5 Sheets-Sheet. 4. R F vSPROULE RELIEF COLOR SCREW STAMPING PRESS.

No. 566,239. Patented Aug. 18, 1896..

(No Model.) -5 Sheets-Sheet 5. R. F. SPROULE. RELIEF COLOR SCREW STAMPING EHESS.

No. 566,239. Patented Aug. 18, 1896.

1H: Nonms PETERS co, worum-mol. wAsmNcou D c UNITED STATES PATENT rmcn.

ROBERT F. SPROULE, OF KITTSBURY, ENGLAND.a

RELIEF-COLOR SCREW STAM PING-PRESS.

SPECIFICATION forming part of Letters Patent No. 566,239, dated August 18, 1896.

Application filed February 21, 1896. Serial No. 580,277. (No model.)

T0 all whom t may concer-n.:

Beit known that LROBERT FRITH SPROULE, a citizen of England, residing at Kittsbury, Berkhampstead, in the county of Hertford, England, have invented an Improvement in Relief Color Screw Stamping Presses, of which the following is a specification.

My invention relates to stamping-presses of the kind in which an engraved lower die is caused to travel under a color-brush and wiper and then under an upper or counter die, which is caused by a screw to descend upon and impress with color a piece of paper or other receptive material interposed between the dies.

The chief object of my invention is to obtain all the required movements, suitably timed, from a continuously-rotating shaft, and to provide for adjustment of the impression, as I shall describe, referring to the accompanying drawings.

Figure lis afront view of a press embodying my invention. Fig. 2 is a plan. Fig. 3 is an elevation of the left side. Fig. 4c is an elevation of the right side. Fig. 5 is a section on the line .9c .r of Fig. 2.

A is the main shaft, provided with iiywheel Al and fast-and-loose pulleys A2. A grooved cam A3 on the shaft A acts on the roller of a guided sliding rod B, which has connected to it7 by an adjusting-screw and nuts B, a rack B2, caoutchouc or other elastic washers B3 being interposed between the end part of the rod B, through which the screw passes, and the washers compressed by the nuts B for the purpose of deadening shock. The rack B2 gears with a pinion C at the lower end of a vertical rock-shaft C, on the upper end of which is fixed a toothed segment C2, gearing with a pinion C3, xed on the press-screw D. The pinion C3 is of such depth that it remains in gear with the segment C2 during the whole up-anddown stroke of the screw D.

In order to relieve the screw from lateral strain, I prefer to hollow the pinion C2 at its under side and to provide on the top of the frame a boss D', on which the pinion revolves as on a bearing.

On the shaft A is fixed a grooved eccentric E, engaging in its groove a roller on a horizontally-slidin g rod E', terminating in a rack gearing with a pinion E2. On the shaft of this pinion is a grooved barrel-cam E3, in the groove of which is engaged a traveling roller E4 on a stud projecting down from the sliding table F, which carries the lower die F and the ink or color duct F2.

It is to be understood that the cam is of sufcient length to cause the die F' to move to the right far enough to pass the color-brush G, which receives color from the duct F2 as it passes under it. The slide of the brush has a to-and-fro movement imparted to it by an arm G on a vertically-rocking shaft G2, another arm G3 on which is moved by a rod G4, which has a roller engaged in the groove of a cam G5. This cam is of such shape and so set on the shaft A that the brush G receives its to-and-fro movement while the die F is under it, the die being thus coated with the color. As the die moves to the left with the color on it it passes in the usual way under a strip H of paper, by which the super* fluous color is wiped off, leaving the color only in the engraved lines. At everystroke of the table F a stud F3 at its side moves to the right a lever-arm H4, which carries a pawl engaging in a ratchet-wheel on the aXis of a reel H2, so that the reel being partly turned winds on it a portion of the strip H, which is drawn from a reel H2 and carried under guiderollers and a pad H'. Thus every time the die F passes under H a fresh portion of the strip H effects the wiping. Vhen the stud F2 returns to the left, a weight HG causes the lever-arm H3 to return against a fixed stopstud H5.

From the above description of the operating part of the press it will be understood that, as the shaft A revolves, the cam A2, through its connections to the pinion C3, causes the screw D to turn alternately in opposite directions, thus causing the upper die D5 to descend alternately upon the paper or other material placed on the lower die F', giving the impression, and to ascend, leaving the impressed piece of material free to be removed and a fresh piece to be placed on F. Also the eccentric E causes the barrel-cam E3 to revolve to and fro, thus causing the table F and the die F upon it to move alternately ICO , its to-and-fro movement, so as to coat the lower die with color, and the stud F3 causes the reel H3 to revolve step by step, so as to bring fresh portions of the strip Il to wipe the die.

In order to vary the force of the impression, I mount upon the screw cross-head D2 a right and left hand screwed spindle D3,which passes through threaded holes in the balls D4. By

turning the screw-spindle D3 in the one direction or the other the balls D4 can be moved simultaneously and equally toward or away from the axis of the screw, thus giving less or greater force to the impression of the die.

Many parts of the press which I have dcscribed are old and well known, such as the screws, the dies, the traveling table, and the inker and wiper for the die, and to these I make no claim.

Having thus described the nature of my invention and the best means I know for carrying the same into practical effect, I claiml. In a relief-color screw stamping-press, the combination with apress-screw which carries a die, of a continuously-rotating shaft having an eccentric disk, a horizontally-sliding rod having at one end a rack and at the other end a roller which engages a cam-race in the eccentric disk, a vertical rock-shaft having a pinion with which the teeth of said rack-bar mesh, and a toothed segment on the said rock-shaft having mesh with a pinion on the press-shaft,the latter having a face of suoli depth that it retains mesh with the toothed segment during the vertical movement of the press-screw in either direction, substantially as described.

2. In a relief-color screw-press, the combination with a press-screw which carries a die of a continuously-rotating shaft carrying a disk eccentrically mounted thereon, a horizontally-sliding rod having at one end a roller which engages a cam-race in the eccentric disk, and provided at the other end with a rack of teeth, a vertical rock-shaft having a pinion meshing with said rack of teeth, a pinion on the press-shaft having its toothed face of such depth that it remains in mesh with a toothed segment on said vertical rock-shaft during the movement of the press-shaft in both directions, a grooved barrehoam having a pinion on its shaft, a rack-bar meshing with said pinion, a disk eccentrically mounted on the continuously-rotatin g shaft,havin-g a camrace in which lies a roller on the end of the rack-bar, and a table moving beneath the die on the press-shaft and having a roller lying in the groove in the barrel-cam, substantially as described.

3. In a relief-color screw-press, the combination with a traveling table carrying the lower die, of a color-brush, a continuouslyrotating shaft, a cam on said shaft, and a series of levers operated by said cam. to give a to-and-fro movement to the color-brush, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 12th day of February, A. D. 1896.

ROBERT F. SPROULE. Vfitnesscs:

OLIVER IMRAY, J No. P. M. MILLARD. 

